Chāndogya Upaniṣad 2.9.6

2.9.6

atha yad ūrdhvaṃ madhyaṃdināt prāg aparāhṇāt sa pratihāraḥ \
tad asya garbhā anvāyattāḥ \
tasmāt te pratihṛtā nāvapadyante \
pratihārabhājino hy etasya sāmnaḥ \\209.6\

6. Now, when it is past mid-day and before [the latter part of] the afternoon—that is a Pratihāra (Response). Fetuses are connected with this [part] of it. Therefore they are taken [or, held] up (pratihṛta) and do not drop down. Truly, they are partakers in the Pratihāra of that Sāman.